Scheme is an actively used programming language created in 1970.

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Example code from the Hello World Collection:

; Hello World in Scheme

(display "Hello, world!")
(newline)

Example code from Linguist:

(define-library (libs basic)
    (export list2 x)
    (begin
        (define (list2 . objs)  objs)
        (define x 'libs-basic)
        (define not-exported 'should-not-be-exported)
        ))

Example code from Wikipedia:

(set! +
      (let ((original+ +))
        (lambda args
          (if (and (not (null? args)) (string? (car args)))
              (apply string-append args)
              (apply original+ args)))))
(+ 1 2 3)
===> 6
(+ "1" "2" "3")
===> "123"
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Last updated February 11th, 2019